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Technology

Grade 7

Working with wind and water

Module 8

Making a water-wheel

INVESTIGATION

Problem situation

You are required to lift a certain number of drawing pins over a distance of 60 cm. Your power source is 4 ℓ of water that is supplied 1,5 m above the rotor in a 3 mm plastic pipe.

Design limitations

You may use any one of the following:

For the rotor:

  • a cork stopper or
  • two cardboard circles, each with a diameter of 20 cm or
  • an empty cotton reel

For the axle:

  • two toothpicks or
  • a knitting needle or
  • a 15 cm nail or
  • a long rounded pencil or
  • a kebab skewer

For the blades:

  • two egg boxes from which the “cups” have been cut out or
  • thick cardboard or
  • an empty 2 ℓ plastic cool drink bottle from which the blades can be cut or
  • a plastic margarine punnet from which the blades can be cut or
  • plastic teaspoons or
  • plastic ice-cream scoops (the flat kind)

Examples of water-wheels:

For the stand:

  • a ruler with wire that is fastened to the axle at both ends or
  • a piece of wood with string that is fastened to the axle or
  • an empty 2 ℓ plastic bottle with the bottom cut out or
  • a large plastic juice bottle or
  • a 2 ℓ plastic milk bottle

To supply the water source:

  • a jug that is marked in litres
  • a length of plastic tubing (1,5 m long, 3 mm in diameter) fastened to a funnel

To catch up the water: a large, flat plastic bowl

To lift the drawing pins (the hoisting apparatus):

  • string or
  • wool
  • a bowl with a flat bottom for the drawing pins
  • an eyelet

You will also need:

  • a pair of scissors
  • Prestik
  • plasticine
  • adhesive tape
  • a knife
  • glue
  • waterproof paint and varnish
  • a paint brush
  • a stapler
  • a pencil
  • a ruler
  • a stylus
  • a protractor (for positioning the blades)

Assignment 1:

To analyse a situation

[lo 1.5]

Let us analyse the situation and write a design proposal. (A design proposal is a short statement that could describe a probable solution.)

Complete the following:

I am going to design and make a ________that will be capable of lifting a

number of __________over a distance of _________cm vertically

by using some of the suitable material and tools that have been mentioned.

Design

Assignment 2:

To do research on hoisting apparatus and turbines

[lo 1.4]

Do research on hoisting apparatus (pulleys) and turbines (water-wheels) and draw or paste pictures of existing or antique machines. Briefly explain how they worked. (Find out more about the Egyptian shadoof or the water-wheels of Archimedes.)

Name the reference sources you made use of________________

Memorandum

Assignment 1

  • water wheel/crane (hoisting apparatus)
  • drawing pins
  • 60cm

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
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Source:  OpenStax, Technology grade 7. OpenStax CNX. Sep 10, 2009 Download for free at http://cnx.org/content/col11032/1.1
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